Brake



Sept. 6, 1932. R s SANFQRD 1,876,077

BRAKE Filed Sept. 4, 1928 A TT ORNEY Patented Sept. 6, 1932 UNITEDSTATES PATENT OFFICE ROY S. SANFORD, OF SOUTH BEND, INDIANA, ASSIGNOR TOBENDIX BRAKE COMPANY, F SOUTH BEND, INDIANA, A CORPORATION OF ILLINOISBRAKE Application led September 4, 1928. Serial No. 303,716.

This invention relates to brakes and is illustrated as embodied in aninternal expanding brake for an automobile. An object of the inventionis to provide the brake with simple positioned by a device carried bythe backing plate of the brake and which is readily adjusted from theoutside of the brake and which is shown in the form of an eccentricengaging the lever. j

The lever is preferably forked to engage the articulating pivot,although any suitable construction giving the necessary guide surfaceson the lever can be used, and it may be arranged either with the slotbetween the forked arms extending in the direction of movement of thearticulating pivot, in which case the fork embracesthe pivot withsubstantially no clearance, or at right angles to the direction ofmovement of the pivot, in

which case the fork has suiicient clearance to allow the brakeapplyingmovement of the articulating pivot.

The above and other objects and features of the invention, includingdetails of the construction of the novel stop, will be apparent from thefollowing description of the illustrative embodiments shown in theaccompanying drawing, in which: Figure 1 is a vertical section throughthe brake just inside the head of the brake drum and showing the brakeshoes in side elevation; i

Figure 2 is a partial section through the brake on thev line 22 ofFigure 1 and showing some of the details of construction; and Figure 3is a detailed section showing a modification, and being in effect asection on the line corresponding to the line A-A of Figure 2.

The brake in which the invention is shown embodied includes a rotatabledrum 10, at the open side of which is arranged -a support such as theusual backing plate 12 and within `which is arranged the friction meansof the brake. rlhe frictionmeans of this particular brake includes aiioating primary shoe 14 connected by a floating articulating l joint orpivot 16 to a secondary shoe 18 anchored on a ixed pivot 20, togetherwith an auxiliary shoe 22 anchored on a fixed pivot 24. The brake isapplied by means such as a double cam 26 which forces shoes 14 and 22apart against lresistance of a return spring 28, whereupon the shoe 14forces the shoe 18 against the drum against the resistance of anauxiliary return spring 30. In this drawing I have shown my novel stop yused to determine the idle position of the articulating pivot 16, whichis preferably grooved adjacent the endnearest the backing plate to yforman end flange 34.

In the arrangement of Figures 1 and 2 the stop includes a bell cranklever 36 of stamped steel mounted on a pivot 38 carried by the backingplate 12 and which is forked at its end to interlock with the flange 34of the pivot 16 to prevent axial movement of the pivot, the forkedportion of the lever embracing the groove in the end of the pivot 16.The space between the arms of the fork is slightly greater than thediameter of the grooved portion of the nivot 16 so that there is aclearance at one side of the grooved portion of ,the pivot. When thebrake is released, the spring 30 pulls the grooved portion of thearticulating pin 16 a ainst the upper side of the fork in the end o thelever 36, thus determining the idle position of the shoe 18. YTheposition of the lever 36 may be adjusted to vary the clearance of theshoe 18 with respect to the brake drum by means Such as an eccentric 40extending through the backing plate 12 so that it can be operated fromoutside the backing plateV and which engages the end of the bell cranklever opposite the articulating pin 16.

In the arrangement of Figure 3 there is a lever 136 mounted on a pivot138 and having its position determined by an eccentric 100 140, in thesame general manner asfdescribed above, but in this case the lever 136has its slot 'arranged in the direction of movement of the articulatingpivot 1,6 so thatit closely embraces the grooved portion -of the pivotland serves as aguide therefor.

While two illustrative embodiments have been described in detail, it isnot my inten tion to limit the scope of the'invention to those'particular embodiments or otherwisev than by the terms of the appendedclaims.

I claim:

1. A brake comprising pivotally connected friction means, a pivotallymounted bellcrank lever havin one arm engagin the pivotalconnectiongtogether with an adjustable device engaging and determiningthe position of the other arm of said lever.

2. A brake comprising friction elements connected'by a pivot, apivotally mounted bellcrank lever with one arm having a slidingengagement 'with the pivot, together with an adjustable eccentricengaging and determiningthe position-of the other arm of said lever. y

3. A brake comprising shoes connected by a. floating pivot having agrooved end, in

. combination with a positioning lever havinlg other end. j. 4. A brakecomprising shoes connected by one end embracing and interlocking witsaid grooved end, and an adjustable eccen- I tric'A forl pivotally`mounting the lever at its a floating pivot having a grooved end, incombination with a positioning lever having one end embracing andinterlocking with said grooved end, and an adjustable eccentric engagingthe other end.

5. A brake comprising shoes connected by a floating pivot, a leverhavingone end embracingthe pivot with substantial clearance and anadjustablefeccentric providing a pivotal support for the other end ofthe lever. l

I. 6. A brake comprising shoes connected lby a floating pivot,` a bellcrank lever having its 4knee supported on a iXedl pivot and one endembracing the floating pivot Withsubstantial clearance and an adjustableeccentric adaptable l-for engagement with the other end of the lever.

vIn testimony whereof, I have hereunto si ed m name.

gn y ROY S. SANFORD.

